KR20140042448A - Ethernet extender, method for clock synchronizing and for power supply - Google Patents

Abstract

The present invention relates to an Ethernet extender, a clock synchronizing method, and a power supply method. The Ethernet extender for extending an Ethernet transmission distance comprises an oscillator for creating a system clock; a first gigabyte Ethernet physical part into which the system clock is inputted as a first reference clock and which transmits first Ethernet data to a first Ethernet device connected to the first gigabyte Ethernet physical part through a first Ethernet cable by synchronizing the first Ethernet data with the first reference clock; and a second gigabyte Ethernet physical part into which the system clock is inputted as a second reference clock and which transmits and receives second Ethernet data to/from a second Ethernet device connected to the second gigabyte Ethernet physical part through a second Ethernet cable by synchronizing the second Ethernet data with the second reference clock. [Reference numerals] (509) First gigabyte Ethernet physical part; (511) Second gigabyte Ethernet physical part; (521) Oscillator; (600) Remote network equipment; (AA) POE extender

Description

ETHERNET EXTENDER, METHOD FOR CLOCK SYNCHRONIZING AND FOR POWER SUPPLY}

The present invention relates to an Ethernet extender, a clock synchronization method, and a power supply method.

Generally, Ethernet refers to a communication method based on the IEEE 802.3 standard. The most widely used Ethernet standard is a method called "10 / 100Based-T", which is a LAN transmission method that transmits and receives data of 10Mbps or 100Mbps through UTP (Unshielded Twisted Pair) cable. In this method, Ethernet data signals are transmitted / received through 100ohm UTP cable using RJ-45 connector, and signal transmission is possible up to 100m.

At present, this method is widely used in almost all switches, hubs, routers, and the like, and it will be recognized as the dominant Ethernet communication method until all communication methods are switched to optical.

This 10 / 100Based-T Ethernet transmission method can transmit and receive up to 100m through the UTP cable, it is a very suitable method for building an indoor network environment.

In this Ethernet system, the maximum transmission distance is 100m when transmitting data using STP (shielded twisted pair) / UTP cable. In case of extending the transmission distance in the existing Ethernet system or 100m in the new Ethernet system system, the Ethernet extender can be used to extend the transmission distance up to 200m.

In addition, Power Over Ethernet (PoE) enables IP-based network terminals such as IP phones, WLAN access points, web cameras, and so on without altering the Ethernet's existing Cat.5 wiring fundamental structure. This refers to a technique of providing a direct current (DC) power source to them while transmitting data signals. PoE technology ensures that the existing structured wiring is safe while ensuring proper operation of the existing network and can reduce costs as much as possible.

Here, a function of supplying power to a device to be connected via an Ethernet cable is a PoE extender.

However, no technique for providing clock synchronization has been proposed among conventional POE extenders.

In addition, in general Ethernet network, Ethernet extender function and PoE extender function alone can realize the necessary functions, that is, Ethernet network expansion and power supply), but this is because Ethernet data transmission is an asynchronous data transmission network. However, in the case of a mobile communication network, data must be synchronized to a clock so that information can be normally transmitted without data loss.

However, when a general Ethernet extender is used for clock synchronization, it is virtually impossible to supply a remote device with a clock used in a mobile communication network unless a GPS device or a network for supplying a separate clock is provided.

An object of the present invention is to provide a giga-bit POE extender having a clock synchronization function for application to a system in which clock synchronization is important, such as a mobile communication device.

An Ethernet extender according to an embodiment of the present invention is an Ethernet extender that extends an Ethernet transmission distance, and includes an oscillator for generating a system clock, an input of the system clock as a first reference clock, and a first reference clock. A first gigabit Ethernet physical unit that transmits first Ethernet data to a first Ethernet device connected through a first Ethernet cable through a first Ethernet cable, and receives the system clock as a second reference clock and synchronizes the second reference clock. And a second gigabit Ethernet physical unit configured to transmit and receive second Ethernet data with a second Ethernet device connected through a second Ethernet cable.

The first Giga Ethernet physical unit,

Extracting a clock signal from first Ethernet data received from the first Ethernet device,

The oscillator,

The system clock may be generated in phase with the clock signal.

The first device is connected to the Ethernet physical unit and the oscillator, the first device further comprises a phase detector for deriving a phase difference between the clock signal output from the Ethernet physical unit and the system clock generated in the oscillator to the oscillator and,

The oscillator,

The system clock may be adjusted to have the same phase as the clock signal by using the phase difference.

The phase difference is represented by a voltage value,

The oscillator,

The system clock may be adjusted using the voltage value.

The oscillator,

It may include a voltage controlled crystal oscillator (VCXO).

The first Ethernet device is a Power Over Ethernet (POE) equipment, the second Ethernet device is a plurality of network terminals,

A first connector connecting the first Ethernet cable to an inside of an Ethernet extender, a first transformer connected to the first connector and outputting an AC voltage separated from the first Ethernet data, and connected to the first transformer, DC conversion unit for converting and outputting an AC voltage DC, an electronic device (PD, Powered Device) receiving a DC voltage output from the DC converter, a power supply device for receiving and outputting the DC voltage from the electronic device (PD) (PSE, Power Sourcing Equipment), a second transformer that receives the DC voltage from the power supply device (PSE) and includes the DC voltage in a data signal output from the second Ethernet physical unit, and the second transformer And a second connector configured to output a data signal including the DC voltage output by the second Ethernet cable. have.

A power supply unit for supplying power for use in an Ethernet extender, and a DC / DC converter for supplying power to the power unit by converting the DC voltage received from the electronic device PD to DC. can do.

A clock synchronization method according to another aspect of the present invention is a clock synchronization method of an Ethernet extender (Ethernet Extender) to extend the Ethernet transmission distance, the first Ethernet data from a first Ethernet device connected to the Ethernet extender via a first Ethernet cable Receiving a signal; extracting a clock signal from the Ethernet data; generating a system clock having a phase in phase with the clock signal; and a second Ethernet device connected through a second Ethernet cable using the system clock as a reference clock; And transmitting and receiving second Ethernet data.

The method may further include transmitting the first Ethernet data through the first Ethernet cable using the system clock as a reference clock.

Wherein the generating comprises:

Generating the system clock, deriving a phase difference between the clock signal and the system clock, and adjusting the system clock by the phase difference such that the system clock has the same phase as the clock signal; can do.

The deriving step,

Outputting the phase difference as a voltage value,

Wherein the adjusting comprises:

And adjusting the system clock by using the voltage value.

According to another aspect of the present invention, a power supply method is a power supply method of an Ethernet extender that extends an Ethernet transmission distance, wherein the Ethernet extender is connected to a first Ethernet device from a first Ethernet device connected through a first Ethernet cable. Receiving data, separating an AC voltage from the Ethernet data, converting the AC voltage to a DC voltage, converting the DC voltage to a powered device (PD) and a power sourcing equipment (PSE) Processing to be available to a second Ethernet device connected via a second Ethernet cable using a;), including the processed DC voltage in a data signal, and including the data signal including the DC voltage in the second Ethernet. Outputting to a cable.

The first Ethernet device may be a Power Over Ethernet (POE) device, and the second Ethernet device may be a plurality of network terminals.

The method may include DC-DC conversion of the DC voltage processed by the electronic device PD, and supplying the DC-DC converted voltage to an internal power supply of the Ethernet extender.

According to the embodiment of the present invention, the power supply of the system can be stably supplied and the clock synchronization can be implemented without configuring a separate power line to the Ethernet extender device and the remote device.

1 is a connection reference diagram between a POE device and a network device of a POE method using an Ethernet extender according to an embodiment of the present invention.
2 is a block diagram of an Ethernet extender according to an embodiment of the present invention.
3 is a clock flow diagram according to an embodiment of the present invention.
4 is a flowchart illustrating a clock synchronization method according to an embodiment of the present invention.
5 is a flowchart illustrating a power supply method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Also, the terms " part, "" module," and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

Now, an Ethernet extender, a clock synchronization method, and a power supply method will be described with reference to the drawings.

1 is a connection diagram between a POE device using a POE extender according to an embodiment of the present invention and POE network equipment.

Referring to FIG. 1, in the case of a Power Over Ethernet (hereinafter referred to as 'POE') device 100, an uninterruptible power supply (UPS) 200 that supplies power and an external device It is connected to the Ethernet switch 300 that receives the data, the network device 400 of the POE method, that is, for example, SOIP (Service On IP) phone, Wireless Access Point (WAP), Bluetooth Access Point (Bluetooth Access Point: BAP) supplies the data and the voltage for the operation of the network device at the same time through the cable. That is, in the case of the POE network device, it is possible to simultaneously receive power for data and operation from the POE device 100 without connecting a separate power supply device.

At this time, the Ethernet extender 500 is connected to the POE device 100 and a plurality of network terminals 600 located at a remote location to extend the Ethernet transmission distance.

The Ethernet extender 500 is a device capable of extending power supply and data at the same time. In order to apply to a clock synchronization-critical system such as a mobile communication device, a Giga-bit POE extender having a clock synchronization function is provided. Extender).

The distance that can transmit and receive data using a general Ethernet device is about 100m. However, there are many places where the distance is over 100m. Therefore, when configuring the Ethernet network using the Ethernet extender 500, it is possible to stably supply power to the system without configuring a separate power line to the Ethernet extender and the remote network device.

In addition, the Ethernet extender 500 receives the transmission data transmitted from the upper device, that is, the POE device 100, to the internal Gigabit Ethernet physical (PHY) (505 of FIG. 2), and then receives this signal to the new Gigabit Ethernet physical (PHY). (507 of FIG. 2) to transmit data to the lower device, that is, the network device 600 of the remote location. Similarly, the data sent from the lower device 600 transmits the data to the upper device 100. As such, by transmitting a new electrical signal by amplifying the weakened electrical signal again through the internal Giga Ethernet physics (505, 507 of Figure 2) it is possible to prevent data loss due to the extended distance.

In addition, the Ethernet extender 500 may have a clock synchronization function to supply a clock used in a mobile communication network to a remote network device 600 without additional equipment or cost.

The configuration of the Ethernet extender 500 is shown in FIG.

2 is a block diagram of an extender according to an embodiment of the present invention.

Referring to FIG. 2, the Ethernet extender 500 includes a first connector 501, a second connector 503, a first transformer 505, a second transformer 507, and a first Giga Ethernet physical (Giga). Ethernet PHY unit 509, second Giga Ethernet physical unit 511, PD (Powered Device) module 513, PSE (Power Sourcing Equipment) module 515, DC-DC converter (dc / dc converter) 517, phase detector 519, oscillator 521, bridge diode circuit 523, Ethernet data signal line 525, system power supply 527, POE output power 529, direct current extracted from Ethernet signal (DC) power supply 531 and clock signal lines 533 are included.

The first connector 501 and the second connector 503 may be RJ45 connectors. This is a connector for connecting an Ethernet cable (UTP) to the inside of the system. 8 pins can be used according to the Ethernet specification.

Here, the first connector 501 connects the first Ethernet cable to which the POE device 100 is connected to the inside of the Ethernet extender 500.

The second connector 503 connects a second Ethernet cable connected to a plurality of network devices 600 located at remote locations with the inside of the Ethernet extender 500. Here, the second connector 503 outputs a data signal including a DC voltage output from the second transformer 507 through a second Ethernet cable.

The first transformer 505 and the second transformer 507 are transformers having a PoE function, and are a type of transformer that changes the magnitude of an external signal and an internal signal. When the first transformer 505 and the second transformer 507 apply a voltage to a signal from an external device and transmit the signal, a transformer having a function of separating a voltage or putting a voltage on a signal line in addition to a signal conversion function to be.

Reference numeral 531 denotes a power source separated from the first transformer 505, and reference numeral 529 denotes a power source supplied to a signal line to supply power to the lower side.

The first Giga Ethernet physical unit 509 and the second Giga Ethernet physical unit 511 convert a signal transmitted from a physical device, that is, an Ethernet cable (for example, a UTP cable) from an external device into a digital signal or vice versa. It is an electronic component. In addition, the transmission speed has the capability to support the gigabit speed.

Here, the first Giga Ethernet physical unit 509 receives the system clock generated by the oscillator 521 as a first reference clock. The first Ethernet data is synchronized with the first reference clock to transmit the first Ethernet data to the first Ethernet device, that is, the POE device 100, connected through the first Ethernet cable.

In addition, the second Gigabit Ethernet physical unit 511 receives the system clock generated by the oscillator 52! As the second reference clock. In addition, the second Ethernet clock is synchronized with the second reference clock to transmit and receive second Ethernet data to and from a second Ethernet device, that is, a network device 600 at a remote location, connected through a second Ethernet cable.

The PD module 513 is a device receiving power from an Ethernet cable in a technology capable of supplying and receiving power using PoE, that is, an Ethernet cable, and the power supplied from the POE device 100 connected to the first connector 501. Used to get

The PSE module 515 extracts the power supplied from the POE device 100 connected to the first connector 501, and then supplies power to the network device 600 of the remote location connected to the second connector 503. Used as

The DC-DC converter 517 is an electronic component necessary to make the power extracted from the PD module 513 into the power required in the system of the Ethernet extender 500.

The DC voltage input from the PD module 513 is DC-DC converted and supplied to the power supply unit 527.

The phase detector 519 is an electronic component for extracting a difference value by comparing the phases of two clocks.

The phase detector 519 extracts a phase difference between the clock signal output from the clock signal line 533 and the system clock generated by the oscillator 521. At this time, the phase difference is represented by a voltage value. The phase difference is transmitted to the oscillator 521 so that the system clock generated by the oscillator 521 is synchronized with the clock signal output from the clock signal line 533.

The oscillator 521 is a voltage controlled crystal oscillator (VCXO), and has a function of adjusting a generated system clock with a voltage. The oscillator 521 adjusts the output of the system clock to the voltage output from the phase detector 519. That is, the system clock is output in the same phase as the clock signal output from the clock signal line 533. As such, the output system clock is input to the reference clocks of the first and second Gigabit Ethernet physical units 509 and 511, respectively.

The bridge diode circuit 523 rectifies the power supplied from the POE device 100 into a DC power supply as a rectifying circuit.

The Ethernet data signal line 525 is a data signal line connecting the first Giga Ethernet physical unit 509 and the second Giga Ethernet physical unit 511. The signal extracted from the first transformer 505 (that is, the signal coming from the POE device 100) is transferred to the second transformer 507. At the same time, it is a data signal line that transmits the signal extracted from the second transformer 507 (that is, the signal coming from the remote network device 600) to the first transformer 505.

The power supply unit 527 supplies a DC power available inside the system of the Ethernet extender 500. At this time, the power supplied from the POE device 100 is used as the system internal power and at the same time as the power supplied to the remote network device 600.

The clock signal line 533 outputs the clock signal extracted by the first Giga Ethernet physical unit 507 from the first Ethernet data to the phase detector 519.

The operation of the Ethernet extender 500 will now be described. In this case, the clock synchronization method and the power supply method will be described separately.

Here, the same reference numerals will be used in connection with the components of FIGS. 1 and 2.

First, FIG. 3 is a flowchart illustrating a clock according to an embodiment of the present invention, and FIG. 4 is a flowchart illustrating a clock synchronization method according to an embodiment of the present invention.

Referring to FIG. 3, the clock source of the POE device 100 is transferred to the Ethernet extender 500 through the first Ethernet data. The Ethernet extender 500 controls the oscillator 521 by extracting a clock signal from the first Ethernet data. That is, the system clock generated by the oscillator 521 has the same phase information as that of the higher clock source, that is, the clock signal of the POE device 100.

At this time, the system clock of the oscillator 521 is supplied to the reference clocks of the respective Gigabit Ethernet physical units 507 and 509.

Here, the first Giga Ethernet physical unit 509 transmits the first Ethernet data to the POE device 100 in synchronization with the first reference clock. Accordingly, the POE device 100 receives the first Ethernet data synchronized to the first reference clock having the same phase as the clock transmitted by the POE device 100.

The second Giga Ethernet physical unit 509 also transmits Ethernet data to the remote network device 600 in synchronization with the second reference clock. Then, the remote network device 600 receives and uses this second reference clock. In addition, even when the network device 600 transmits the second Ethernet data to the Ethernet extender 500, the network device 600 transmits the second Ethernet data in synchronization with the second reference clock.

Referring to FIG. 4, the first connector 501 of the Ethernet extender 500 receives the first Ethernet data from the POE device 100 connected through the first Ethernet cable (S101).

Next, the first Giga Ethernet physical unit 507 extracts a clock signal from the first Ethernet data (S103).

Next, the phase detector 519 calculates a phase difference between the system clock generated in the oscillator 521 (S105) and the clock signal extracted in step S103 (S107).

Next, the oscillator 521 adjusts the system clock such that the oscillator 521 is a system clock having the same phase as the clock signal using the voltage value indicated by the phase difference output from the phase detector 519 (S109).

Next, the oscillator 521 supplies the system clock adjusted in step S109 to the first reference clock of the first Gigabit Ethernet physical unit 509 and the second reference clock of the second Gigabit Ethernet physical unit 511 (S111). .

Then, the first Giga Ethernet physical unit 509 outputs the first Ethernet data through the first Ethernet cable in synchronization with the first reference clock, and the second Giga Ethernet physical unit 511 synchronizes with the second reference clock. 2 outputs second Ethernet data through the Ethernet cable (S113).

5 is a flowchart illustrating a power supply method according to an embodiment of the present invention.

Referring to FIG. 5, the first connector 501 of the Ethernet extender 500 receives first Ethernet data from the POE device 100 connected through the first Ethernet cable in step S201.

Next, the first transformer 505 separates the AC voltage from the first Ethernet data (S203).

Next, the bridge diode circuit 523 converts the AC voltage extracted from the first Ethernet data supplied through the DC power line 531 into a DC voltage (S205).

Next, the converted DC voltage is input to the PD module 513, processed, and then output to the PSE module 515, and then processed by the PSE module 515, and then the second through the POE output power supply 529 line. Delivered to transformer 507.

Next, the second transformer 507 includes the DC voltage supplied through the POE output power line 529 in the second Ethernet data (S209). The second Ethernet data including the DC voltage is output to the second Ethernet cable through the second connector 503 through the second Giga Ethernet physical unit 511.

On the other hand, after DC-DC conversion of the DC voltage converted in step S205 output by the PD module 513 (S211), the DC-DC converted DC voltage power supply unit 527 is a system power supply of the Ethernet extender 500 It is supplied as (S213).

The embodiments of the present invention described above are not implemented only by the apparatus and method, but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (14)

Ethernet Extender that extends the Ethernet transmission distance
Oscillator to generate a system clock,
A first giga Ethernet physical unit configured to receive the system clock as a first reference clock, synchronize the first system clock with the first reference clock, and transmit first Ethernet data to a first Ethernet device connected through a first Ethernet cable;
A second gigabit Ethernet physical unit configured to receive the system clock as a second reference clock and to synchronize the second reference clock to transmit and receive second Ethernet data to and from a second Ethernet device connected through a second Ethernet cable;
Ethernet extender including. The method of claim 1,
The first Giga Ethernet physical unit,
Extracting a clock signal from first Ethernet data received from the first Ethernet device,
The oscillator includes:
An Ethernet extender for generating said system clock in phase with said clock signal. 3. The method of claim 2,
The first device is connected to the Ethernet physical unit and the oscillator, the first device further comprises a phase detector for deriving a phase difference between the clock signal output from the Ethernet physical unit and the system clock generated in the oscillator to the oscillator and,
The oscillator includes:
Using the phase difference to adjust the system clock to have the same phase as the clock signal. The method of claim 3,
The phase difference is represented by a voltage value,
The oscillator includes:
An Ethernet extender that adjusts the system clock using the voltage value. 5. The method of claim 4,
The oscillator includes:
Ethernet extender with Voltage Controlled Crystal Oscillator (VCXO). 3. The method of claim 2,
The first Ethernet device is a Power Over Ethernet (POE) equipment, the second Ethernet device is a plurality of network terminals,
A first connector connecting the first Ethernet cable to an inside of an Ethernet extender;
A first transformer connected to the first connector and outputting an AC voltage separated from the first Ethernet data;
A DC converter connected to the first transformer and converting the AC voltage into DC;
Electronic device (PD, Powered Device) module receiving the DC voltage output by the DC converter,
A power supply device (PSE) module for receiving and outputting the DC voltage from the electronic device PD;
A second transformer receiving the DC voltage from the power supply device PSE and including the DC voltage in a data signal output from the second Ethernet physical unit; and
A second connector configured to output a data signal including the DC voltage output from the second transformer to the second Ethernet cable;
Ethernet extender including. The method according to claim 6,
A power supply for supplying power for use inside the Ethernet extender, and
DC / DC (Direct Current to Direct Current) converter which converts the DC voltage received from the electronic device PD to DC-DC and supplies it to the power supply unit.
Ethernet extender including. A clock synchronization method of the Ethernet Extender that extends the Ethernet transmission distance.
Receiving, by the Ethernet extender, first Ethernet data from a first Ethernet device connected through a first Ethernet cable;
Extracting a clock signal from the ethernet data;
Generating a system clock in phase with the clock signal;
Transmitting and receiving second Ethernet data with a second Ethernet device connected through a second Ethernet cable using the system clock as a reference clock.
Clock synchronization method comprising a. 9. The method of claim 8,
Transmitting the first Ethernet data through the first Ethernet cable using the system clock as a reference clock;
The clock synchronization method further comprising. 10. The method of claim 9,
Wherein the generating comprises:
Generating the system clock;
Deriving a phase difference between the clock signal and the system clock, and
Adjusting the system clock by the phase difference such that the system clock has the same phase as the clock signal
Clock synchronization method comprising a. 11. The method of claim 10,
The deriving step,
Outputting the phase difference as a voltage value,
Wherein the adjusting comprises:
Adjusting the system clock using the voltage value. A method of powering the Ethernet Extender that extends the Ethernet transmission distance.
Receiving, by the Ethernet extender, first Ethernet data from a first Ethernet device connected through a first Ethernet cable;
Separating the AC voltage from the Ethernet data,
Converting the AC voltage into a DC voltage,
Processing the DC voltage to be made available to a second Ethernet device connected through a second Ethernet cable using an electronic device (PD) and a power sourcing equipment (PSE);
Incorporating the processed DC voltage into a data signal, and
Outputting the data signal including the DC voltage to the second Ethernet cable
/ RTI > The method of claim 12,
The first Ethernet device is a Power Over Ethernet (POE) equipment, and the second Ethernet device is a plurality of network terminals power supply method. The method of claim 12,
DC-DC conversion of the DC voltage processed by the electronic device PD, and
Supplying the DC-DC converted voltage to an internal power supply of an Ethernet extender
Power supply method further comprising a.

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